Angles in Triangles and on Parallel Lines (2)

In this worksheet, students use angle rules to work out the missing angles in triangles and parallel lines.

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Key stage: KS 2

Year: Year 5 11+ worksheets

Curriculum topic: Maths and Numerical Reasoning

Curriculum subtopic: 2D Shapes: Triangles, Quadrilaterals and Polygons

Difficulty level:

Worksheet Overview

Look at the following diagram.

Angle a° = 58° because it is alternate to the 58° on parallel lines (Z or S shape)

Angle b° = 48° because it is alternate to the 48° on parallel lines (Z or S shape)

Angle c° = 180° - 48° - 58° = 74° for two reasons.....angles in a triangle add up to 180° and angles on a straight line add up to 180°

Angle d° = 180° - 58° = 122° because angles on a straight line add up to 180°

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